Canon imageRUNNER 5055 series, Service Manual

Page: 419 / 596

Chapter 14
14-5
F-14-6
F-14-7
Is there a difference
in density between
front and rear?
Are there vertical
lines in the images?
Clean the following:
1. Mirrors
2. Lens
3. Standard white plate
(mounted to back of
copyboard glass)
4. Copyboard glass
< Making Image Initial Checks> <Checking the Density Slope>
YES
YES
NO
NO
NO
YES
Perform the instructions under
“”for the printer unit.
Is there a
difference in density
between front
and rear?
Execute shading in service mode:
COPIER>FUNCTION>CCD>CCD-ADJ
Execute shading in service mode:
COPIER>FUNCTION>CCD>CCD-ADJ
Clean the mirrors.
E
Clean the following:
1. Mirrors
2. Lens
3. Standard white plate
4. Scanning lamp
5. Reflecting plate
Make a copy of
the NA3 Chart in text mode. Is
gray scale No. 1 (solid black)
too light?
Check the life of the
scanning lamp; if it has
reached the end of its
life, replace it.
< Checking the Solid Black Density >
<Checking for Fogging>
YES
NO
NO
NO
Perform the instructions under
“Checking the Solid Black Density”
for the printer unit.
YES
Is the density of
gray scale No. 1 (solid black)
too low (light)?
Make a copy of
the NA3 Chart in text mode.
Is the white background
foggy?
YES
NO
Make a copy of the
NA3 Chart in AE mode. Is the
output foggy?
K
Execute shading adjustment in service
mode:
COPIER>FUNCTION>CCD>CCD-ADJ.
Executing Potential Control
Turn off and then on the power switch; then,
make a copy.
J
L
G
H
YES
F E